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17th COTA International Conference of Transportation Professionals: Transportation Reform and Change - Equity, Inclusiveness, Sharing, and Innovation, CICTP 2017

作者： Yao, Jie-Ru Song, Yong-Chao Du, Kai Ju, Yong-Feng Bao, Xu Dept. of Electronic and Control Engineering Chang'an Univ. Xi'an Shaanxi710064 China Dept. of Electronic and Control Engineering Chang'an Univ. Xi'an Shaanxi710064 China Dept. of Electronic and Control Engineering Chang'an Univ. Xi'an Shaanxi710064 China Dept. of Electronic and Control Engineering Chang'an Univ. Xi'an Shaanxi710064 China Key Laboratory for Traffic and Transportation Security of Jiangsu Province Huaian Jiangsu223003 China

ISBN: (数字)9780784480915

ISBN: (纸本)9780784480915

To detect a no signal state of "black screen," "blue screen," and "snowflake screen" in surveillance traffic video, this paper proposes a novel detection method of video images with or without signal based on AdaBoost strengthening BP neural network. At first, this method analyzes the characteristics of traffic video images with or without signal and establishes seven characteristic indexes, such as "jump point density," "interval peak ratio," "entropy," "energy," "contrast," "correlation," and "homogeneity";then, we confirmed the structure parameters of the BP neural network and trained the neural network. Finally, the strong classification detector is formed by utilizing the method of "AdaBoost strengthening BP." Experimental results show that the proposed method can dramatically improve the correct detection rate and reduce the false detection rate of traffic video images with or without signal, which has considerable significance in practical applications. © ASCE.

关键词： Adaptive boosting

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A study on PWM techniques for driving PMSM inverter by 150-degree conduction method

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Transactions of the Korean Institute of Electrical Engineers 2019年第2期68卷 285-295页

作者： Lee, Seung-Yong Yoon, Duck-Yong Dept. of Electrical Electronic and Control Engineering Kongju National University Korea Republic of Inverter Division of Seoho Electric Korea Republic of

In this paper, we have studied the PWM techniques for operating inverter for PMSM with 150-degree conduction method. In the conventional upper switch PWM technique, only three upper switches perform PWM switching, so they are very much used and have a large switching loss compared to three lower switches. And torque ripple occurs due to circulating current flowing by difference of back-EMF generated between two stator windings of motor in PWM switching section of inverter where one upper switch for PWM switching is turned off and two lower switches are turned on when motor operate in high speed and at light load. So, we propose a six-switch asymmetrical discontinuous PWM(SADPWM) techniques in order to improve the disadvantages of upper switch PWM technique. The proposed PWM technique can be used as SADPWM1 and SADPWM2 technique by changing the order of PWM switching sections. Computer simulations and experiments were carried out for SPMSM of 750[W] class. Using proposed PWM technique, upper and lower switches have the same PWM switching operation. And circulating current did not flow in stator winding of motor under operating condition in which motor operate at high speed 3000[rpm] and at light load. In addition, it is confirmed that loss of switching elements in inverter is reduced at light load and torque ripple of motor does not occur. Also, in SADPWM2 technique freewheeling current does not flow in the non-conduction section and less operation loss results in comparison to SADPWM1 technique. Because proposed PWM technique can be realized only by software modification in conventional upper switch PWM technique, it can be widely used in applications using 120-degree conduction method. Also, it can be applied to inverter for BLDCM. ? The Korean Institute of Electrical Engineers. Copyright ⓒ The Korean Institute of Electrical Engineers.

关键词： Pulse width modulation

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Dynamic Time-Threshold Based Receive Buffer for Vehicle-to-Cloud Multipath Transmission

Dynamic Time-Threshold Based Receive Buffer for Vehicle-to-C...

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International Conference on Computing, Networking and Communications (ICNC)

作者： Yuyang Zhang Ping Dong Xiaojiang Du Hongbin Luo Hongke Zhang Mohsen Guizani State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University P. R. China School of Electronic and Information Engineering Beijing Jiaotong University P. R. China Dept. of Computer and Information Sciences Temple University USA School of Computer Science and Engineering Beihang University P. R. China Dept. of Computer Science and Engineering Qatar University Qatar

ISBN: (数字)9781728149059

ISBN: (纸本)9781728149066

Vehicle-to-cloud is a network access model that aims to share computing resources for vehicles. In vehicle-to-cloud communication, reliable links are critical. Through multipath transmission, comprehensive utilization of heterogeneous wireless networks between the vehicle and the cloud server can effectively improve the reliability and efficiency of transmission. A large number of studies have pointed out that a receive butter can greatly improve the performance of multipath transmission in vehicle-to-cloud communication. However, most of these studies, which use receive buffers to improve multipath transmission performance, do not explicitly specify the design details of the receive butter. A classic design idea is to use a fixed length receive butter. However, this idea makes it difficult to determine the appropriate butter length in a complex vehicle-to-cloud communication scenario. This paper proposes a Dynamic Time-Threshold (DTT) receive buffer. The DTT receive buffer takes into account the instability of vehicular wireless networks, and dynamically adjusts the time-threshold so that the packets in the receive butter do not affect the overall communication performance due to premature departure or excessive waiting. We verified the performance of the DTT receive butter through a large number of simulations and real tests. By comparison, the performance of DTT receive butter is significantly better than the fixed length receive butter.

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A variable structure-based algorithm for adaptive cruise control 15

A variable structure-based algorithm for adaptive cruise con...

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15th International Workshop on Variable Structure Systems, VSS 2018

作者： Doria-Cerezo, Arnau Olm, Josep M. Benedito, Ernest Biel, Domingo Inst. of Industrial and Control Engineering Universitat Politècnica de Catalunya Dept. of Electrical Engineering Barcelona Spain Inst. of Industrial and Control Engineering Universitat Politècnica de Catalunya Dept. of Mathematics Barcelona Spain Inst. of Industrial and Control Engineering Universitat Politècnica de Catalunya Dept. of Management Barcelona Spain Dept. of Electronic Engineering and Inst. of Industrial and Control Engineering Universitat Politècnica de Catalunya Barcelona Spain

ISBN: (纸本)9781538664391

This paper presents an Adaptive Cruise control algorithm for vehicles based on a variable structure systems approach. The main feature of the proposed design is that the two driving modes, namely distance and speed regulation, are met enforcing sliding modes and asymptotic tracking, respectively. This is achieved using an intervehicle, distance-dependent switching surface able to induce sliding motion when the aimed cruise velocity of the target vehicle is higher than that of the preceding vehicle, and to asymptotically track such cruise velocity when it is lower or equal than the velocity of the preceding vehicle. The algorithm is validated through numerical simulations. © 2018 IEEE.

关键词： Adaptive cruise control

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Bidirectional isolated DC-DC converter with unity gain for low power applications 10

Bidirectional isolated DC-DC converter with unity gain for l...

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10th International Conference on Electrical and Computer engineering, ICECE 2018

作者： Hasan, Md. Nazmul Rodriguez, Ramon Estalella Martinez-Salamero, Luis Martinez, Carlos Olalla Universitat Rovira i Virgili Electronic and Automatic Control Engineering Dept. of Electrical Tarragona Spain Department of Electrical and Electronic Engineering International Islamic University Chittagong Chittagong Bangladesh

ISBN: (纸本)9781538674826

This paper presents the architecture and control of a LLC bidirectional isolated DC-DC converter with unity gain for low power application. The converter features zero voltage switching (ZVS) at light loads, which results in reduced switching loss and thus improves the efficiency. Further improvement of the efficiency has been achieved by operating the converter in burst mode with a constant switching frequency. A control scheme that allows bidirectional power flow is proposed. High frequency ferrite core transformer provides the galvanic isolation between primary and secondary. In addition, resonant inductors have been integrated in the transformer, which reduces the size and cost of the converter. Experimental results show power transfer efficiencies more than 90 % for loads between 1 W to 8 W. © 2018 IEEE.

关键词： Zero voltage switching

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control developments in power electronics-based distributed generators for future grid services

Control developments in power electronics-based distributed ...

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Mediterranean Conference on Power Generation, Transmission, Distribution and Energy Conversion, MEDPOWER 2018

作者： Castilla, Miguel De Vicuña, Luis García Miret, Jaume Camacho, Antonio Guzmán, Ramón Dept. of Electronic Engineering Technical University of Catalonia Vilanova i la Geltrú Spain Dept. of Automatic Control Technical University of Catalonia Vilanova i la Geltrú Spain

ISBN: (纸本)9781839531330

This paper presents practical experiences in an inverter-based microgrid installed at SEPIC research laboratory (Technical University of Catalonia, Spain). These experiences validate recent developments in the control of power electronics-based distributed generators which confirm the opportunity to provide auxiliary services for the utility grid. Harmonic rejection, voltage imbalance reduction, fault-ride through capability, and voltage and frequency regulation are some of the auxiliary services designed to improve the power quality of the future grid. © 2018 Institution of engineering and Technology. All rights reserved.

关键词： Power electronics

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An economic tracking scheme for GPS-gsm based moving object tracking system 2

An economic tracking scheme for GPS-gsm based moving object ...

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2nd International Conference for engineering, Technology and Sciences of Al-Kitab, ICETS 2018

作者： Ameen, Fatima Nadhim Mohammed, Ziad Saeed Sddiq, Abdulrahman Ikram Dept. of Computer Engineering Technical College Northern Technical University Mosul Iraq Dept. of Electronic and Control Eng. Technical College Northern Technical University Kirkuk Iraq

ISBN: (纸本)9781538635780

Many tracking systems are based on the Global Positioning System (GPS), Global System for Mobile communications (GSM) and smart phones, due to their wide availability and reliability. A moving object to be tracked, it sends its GPS coordinates to the observer via SMS. However, the economic feasibility of these systems mainly depends on the total cost of the used SMS messages. In this paper, an economic tracking scheme is proposed to reduce the tracking cost. A GPS-GSM tracking system that uses the proposed scheme is implemented and tested together with two classical tracking systems under two practical test cases. The first test case is a 121 km vehicle trip and the second is a 2.4 km walking journey. The results showed the effectiveness and economic feasibility of the proposed system, which achieved a saving in tracking cost up to about 64% with respect to the tested classical systems. © 2018 IEEE.

关键词： Global positioning system

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Rotor position estimation at zero speed in a sliding mode controlled PMSM 15

Rotor position estimation at zero speed in a sliding mode co...

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15th International Workshop on Variable Structure Systems, VSS 2018

作者： Repecho, Victor Biel, Domingo Universitat Politècnica de Catalunya Inst. of Industrial and Control Engineering Barcelona Spain Inst. of Industrial and Control Engineering Universitat Politècnica de Catalunya Dept. of Electronic Engineering Barcelona Spain

ISBN: (纸本)9781538664391

In this paper a rotor angle estimation for permanent magnet synchronous motors under sliding motion is proposed. In the sliding mode control design stage, if the motor saliency (dependency of the stator inductances with the rotor position) is not considered, the decoupling process provide three independent switching functions that are fully decoupled among them. The technique proposed at this work uses the small deviations that appear in the switching functions when motor saliency is considered. In presence of saliency, the position of the rotor can be estimated measuring the slopes of the switching functions. The novelty of the method is that it can work at zero speed, where most of the estimation techniques based on observers fail, and without the necessity of injecting high frequency signals. © 2018 IEEE.

关键词： Switching functions

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An effective auto-focusing method for curved panel inspection system

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Transactions of the Korean Institute of Electrical Engineers 2017年第4期66卷 709-714页

作者： Lee, Hwang-Ju Park, Tae-Hyoung Dept. of Electronics Engineering Chungbuk National University Korea Republic of Dept. of Control and Robot Engineering Chungbuk National University Korea Republic of

The curved panel is widely used for display of TVs and smart phones. This paper proposes a new auto-focusing method for curved panel inspection system. Since the distance between the camera and the panel varies with the curve position, the camera should change its focus at every inspection time. In order to reduce the focusing time, we propose an effective focusing method that considers the mathematical model of panel curve. The Lagrange polynomial equation is applied to modeling the panel curve. The foci of initial three points are used to get the curve equation, and the other foci are calculated automatically from the curve equation. The experiment result shows that the proposed method can reduce the focusing time. Copyright © The Korean Institute of Electrical Engineers.

关键词： Cameras

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Analysis of operating time of li-polymer secondary cell with or without flyback converter active balancing BMS

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Transactions of the Korean Institute of Electrical Engineers 2017年第5期66卷 786-791页

作者： Kim, Young-Pil Choi, Chul-Hyung Ko, Seok-Cheol Kim, Si-Kyung Dept. of Electrical and Electronic Control Engineering Kongju University Korea Republic of

In this paper, the run time of Li-polymer secondary cell with and without Active Balancing BMS is analyzed. The Active Balancing System using Flyback Converter with two-way power control facility, his designed for optimal characteristics of balancing. The run time of Li-polymer secondary cell is drastically increased employing the Flyback Convert Active Balancing BMS. The run time performance of Li-polymer secondary cell with or without Flyback Converter Active Balancing BMS is analyzed with the discharging and charging experiment of Li-polymer secondary cell. © 2017 The Korean Institute of Electrical Engineers.

关键词： Battery management systems

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